Yijinjing is available. Exercise the internal strength of five internal organs. But you can't walk alone after practicing in the novel.

Nine yin and nine yang are fake. Among them, Jiuyin Zhen Jing is a Taoist classic, which is easy to understand and has no fitness function.

In addition, the so-called "mind method", "practice method" and "formula" given by others, it is best not to "practice" or ponder, which is harmful to the health. If you are really interested in internal training, you can find some accomplished boxers and ask them to point out the maze and learn from them.